Serviceberry (Amelanchier spp.) is a native shrub that attract pollinators, birds, small mammals and insects. Photo courtesy Rob Routledge, Sault College, Bugwood.org The gardener’s emphasis is often on annuals and perennials, but shrubs are an essential component of garden design, said Peggy Koppmann, Master Gardener. There are many reasons to use shrubs: They provide structure and diversity as well as flowers, fruits and autumn foliage. Many “maturing gardeners” make a gradual transition to shrubs to reduce the chores that come…